A NEW EAST AFRICAN TSETSE-FLY. 315 which, although I had never met with it, this fly rather resembles, except in size. On meeting with it in the field, noting its appearance when fresh, examining its genitalia and its puparia, and observing its habits, breeding and other — knowing G. morsitans thoroughly from all over the Territory and having had experience of that species in Portuguese East Africa — I was convinced at once that we v/ere dealing with a new fly." Puparium of G. swynnertoni (fig. 3, b). — The breeding-places of this species are dealt with elsewhere in this number by Mr. Swynnerton himself.* Measurements of five perfect puparia examined in the position shown in fig. 3, i.e., ventral side uppermost, with the tumid lips ("polypneustic lobes " of Newstead) directed away from the observer, are as follows : — length, 5-6 to 6-2 mm. ; greatest breadth (across region of sixth larval segment), 3-2 to 3-5 mm. A comparison with a series of G. morsitans puparia, examined in a corresponding position, shows that, although the actual dimensions of the puparium of the new species are but slightly greater, there are, as will be seen from the above figures, certain conspicuous differences. The most noteworthy of these are as follows : — Shape. — Less regularly oval, the puparium of G. swynnertoni being widest across the region of the sixth larval segment. Tumid lips. — Smaller than those of the puparium of G. morsitans, but separated by a wider notch. Notch between tumid lips. — Closely resembling in shape that exhibited by the puparium of G. pallidipes, Austen. * See p. 333, and Plates xvi and xvii.